English verb conjugation
OUGHT TO GRUB

Regular verb: grub - grubbed - grubbed

Affirmation

Simple form	V-ing form
I ought to grub you ought to grub he ought to grub we ought to grub you ought to grub they ought to grub	I ought to be grubbing you ought to be grubbing he ought to be grubbing we ought to be grubbing you ought to be grubbing they ought to be grubbing
Perfect	V-ing perfect
I ought to have grubbed you ought to have grubbed he ought to have grubbed we ought to have grubbed you ought to have grubbed they ought to have grubbed	I ought to have been grubbing you ought to have been grubbing he ought to have been grubbing we ought to have been grubbing you ought to have been grubbing they ought to have been grubbing

Negation

Simple form	V-ing form
I oughtn't to grub you oughtn't to grub he oughtn't to grub we oughtn't to grub you oughtn't to grub they oughtn't to grub	I oughtn't to be grubbing you oughtn't to be grubbing he oughtn't to be grubbing we oughtn't to be grubbing you oughtn't to be grubbing they oughtn't to be grubbing
Perfect	V-ing perfect
I oughtn't to have grubbed you oughtn't to have grubbed he oughtn't to have grubbed we oughtn't to have grubbed you oughtn't to have grubbed they oughtn't to have grubbed	I oughtn't to have been grubbing you oughtn't to have been grubbing he oughtn't to have been grubbing we oughtn't to have been grubbing you oughtn't to have been grubbing they oughtn't to have been grubbing

Interrogative form

Simple form	V-ing form
ought to I grub? ought to you grub? ought to he grub? ought to we grub? ought to you grub? ought to they grub?	ought to I be grubbing? ought to you be grubbing? ought to he be grubbing? ought to we be grubbing? ought to you be grubbing? ought to they be grubbing?
Perfect	V-ing perfect
ought to I have grubbed? ought to you have grubbed? ought to he have grubbed? ought to we have grubbed? ought to you have grubbed? ought to they have grubbed?	ought to I have been grubbing? ought to you have been grubbing? ought to he have been grubbing? ought to we have been grubbing? ought to you have been grubbing? ought to they have been grubbing?

Interro-negative form

Simple form	V-ing form
oughtn't I to grub? oughtn't you to grub? oughtn't he to grub? oughtn't we to grub? oughtn't you to grub? oughtn't they to grub?	oughtn't I to be grubbing? oughtn't you to be grubbing? oughtn't he to be grubbing? oughtn't we to be grubbing? oughtn't you to be grubbing? oughtn't they to be grubbing?
Perfect	V-ing perfect
oughtn't I to have grubbed? oughtn't you to have grubbed? oughtn't he to have grubbed? oughtn't we to have grubbed? oughtn't you to have grubbed? oughtn't they to have grubbed?	oughtn't I to have been grubbing? oughtn't you to have been grubbing? oughtn't he to have been grubbing? oughtn't we to have been grubbing? oughtn't you to have been grubbing? oughtn't they to have been grubbing?